Woke up this morning to my 2 big Leporinus dead I think the circulation pump malfunctioned, it was making a humming noise and wasn't spinning which I think made the water very hot. It was easily in the high 90's. The digital thermometer was dragged in the tank so it didn't work. I did a 20% water change with cold water and turned off the heaters for now. All the other fish are ok. I did notice several fish on the bottom when they are usually all over the place.